74LS126A

DM74LS126A Quad TRI-STATE Buffer September 1991 DM74LS126A Quad TRI-STATE Buffer General Description This device contains four independent gates each of which performs a non-inverting buffer function The outputs have the TRI-STATE feature When enabled the outputs exhibit the low impedance characteristics of a standard LS output with additional drive capability to permit the driving of bus lines without external resistors When disabled both the output transistors are turned off presenting a high-impedance state to the bus line Thus the output will act neither as a significant load nor as a driver To minimize the possibility that two outputs will attempt to take a common bus to opposite logic levels the disable time is shorter than the enable time of the outputs Connection Diagram Dual-In-Line Package TL F 6388 – 1 Order Number DM74LS126AM or DM74LS126AN See NS Package Number M14A or N14A Function Table YeA Inputs A L H X H e High Logic Level L e Low Logic Level X e Either Low or High Logic Level Hi-Z e TRI-STATE (Outputs are disabled) Output C H H L Y L H Hi-Z TRI-STATE is a registered trademark of National Semiconductor Corporation C1995 National Semiconductor Corporation TL F 6388 RRD-B30M105 Printed in U S A Absolute Maximum Ratings (Note) Supply Voltage Input Voltage Operating Free Air Temperature Range Storage Temperature Range 7V 7V 0 C to a 70 C b 65 C to a 150 C Note The ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaranteed The device should not be operated at these limits The parametric values defined in the ‘‘Electrical Characteristics’’ table are not guaranteed at the absolute maximum ratings The ‘‘Recommended Operating Conditions’’ table will define the conditions for actual device operation Recommended Operating Conditions Symbol VCC VIH VIL IOH IOL TA Parameter Supply Voltage High Level Input Voltage Low Level Input Voltage High Level Output Current Low Level Output Current Free Air Operating Temperature 0 08 b2 6 Min 4 75 Nom 5 Max 5 25 Units V V V mA mA C 24 70 Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol VI VOH VOL Parameter Input Clamp Voltage High Level Output Voltage Low Level Output Voltage Conditions VCC e Min II e b18 mA VCC e Min IOH e Max VIH e Min VCC e Min IOL e Max VIL e Max VIH e Min IOL e 12 mA VCC e Min II IIH IIL IOZH Input Current Input Voltage Max VCC e Max VI e 7V VCC e Max VI e 2 7V VCC e Max VI e 0 4V VCC e Max VO e 2 4V VIH e Min VIL e Max VCC e Max VO e 0 4V VIH e Min VIL e Max VCC e Max (Note 2) VCC e Max 24 0 35 0 25 05 04 01 20 b0 4 Min Typ (Note 1) Max b1 5 Units V V V mA mA mA High Level Input Current Low Level Input Current Off-State Output Current with High Level Output Voltage Applied Off-State Output Current with Low Level Output Voltage Applied Short Circuit Output Current Supply Current 20 mA IOZL b 20 mA IOS ICC b 20 b 100 mA mA 12 22 Note 1 All typicals are at VCC e 5V TA e 25 C Note 2 Not more than one output should be shorted at a time and the duration should not exceed one second 2 Switching Characteristics DM74LS RL e 667X Symbol Parameter CL e 50 pF Min tPLH tPHL tPZH tPZL tPHZ tPLZ Note 1 CL e 5pF CL e 150 pF Min Max 21 22 36 42 Units Max 15 18 30 30 25 25 Propagation Delay Time Low to High Level Output Propagation Delay Time High to Low Level Output Output Enable Time to High Level Output Output Enable Time to Low Level Output Output Disable Time from High Level Output (Note 1) Output Disable Time from Low Level Output (Note 1) ns ns ns ns ns ns Physical Dimensions inches (millimeters) 14-Lead Small Outline Molded Package (M) Order Number DM74LS126AM NS Package Number M14A 3 DM74LS126A Quad TRI-STATE Buffer Physical Dimensions inches (millimeters) (Continued) 14-Lead Molded Dual-In-Line Package (N) Order Number DM74LS126AN NS Package Number N14A LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION As used herein 1 Life support devices or systems are devices or systems which (a) are intended for surgical implant into the body or (b) support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in a significant injury to the user National Semiconductor Corporation 1111 West Bardin Road Arlington TX 76017 Tel 1(800) 272-9959 Fax 1(800) 737-7018 2 A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness National Semiconductor Europe Fax (a49) 0-180-530 85 86 Email cnjwge tevm2 nsc com Deutsch Tel (a49) 0-180-530 85 85 English Tel (a49) 0-180-532 78 32 Fran ais Tel (a49) 0-180-532 93 58 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